Sofa



FIG. 1 is a perspective view of the front, top and one side of a sofa showing my design;

FIG. 2 is a rear perspective view of the sofa of FIG. 1 on a reduced scale;

FIG. 3 is a rear elevational view of the sofa of FIG. 1 on a reduced scale; and

FIG. 4 is a top plan view of the sofa of FIG. 1 on a reduced scale.

The end of the sofa not shown is a mirror image of the end shown in FIG. 2. 

The ornamental design for a sofa, substantially as shown and described. 